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fbdev/smscufx: Detect registered fb_info from refcount

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Detect registered instances of fb_info by reading the reference
counter from struct fb_info.read. Avoids looking at the dev field
and prepares fbdev for making struct fb_info.dev optional.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Steve Glendinning <steve.glendinning@shawell.net>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230613110953.24176-31-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2023-06-13 13:07:05 +02:00
parent 1d4423d3f0
commit f5c6291f12
1 changed files with 2 additions and 2 deletions
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4
drivers/video/fbdev/smscufx.c
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@ -1496,7 +1496,7 @@ static int ufx_setup_modes(struct ufx_data *dev, struct fb_info *info,
u8 *edid;
int i, result = 0, tries = 3;
if (info->dev) /* only use mutex if info has been registered */
if (refcount_read(&info->count)) /* only use mutex if info has been registered */
mutex_lock(&info->lock);
edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
@ -1610,7 +1610,7 @@ error:
if (edid && (dev->edid != edid))
kfree(edid);
if (info->dev)
if (refcount_read(&info->count))
mutex_unlock(&info->lock);
return result;